<?php
/**
 * File::CSV
 *
 * PHP versions 4 and 5
 *
 * Copyright (c) 1997-2008,
 * Vincent Blavet <vincent@phpconcept.net>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @category  File_Formats
 * @package   Archive_Tar
 * @author    Vincent Blavet <vincent@phpconcept.net>
 * @author    Combodo
 * @copyright 1997-2018 The Authors
 * @license   http://www.opensource.org/licenses/bsd-license.php New BSD License
 * @version   CVS: $Id$
 * @link      http://pear.php.net/package/Archive_Tar
 */

define('ARCHIVE_TAR_ATT_SEPARATOR', 90001);
define('ARCHIVE_TAR_END_BLOCK', pack("a512", ''));

if (!function_exists('gzopen') && function_exists('gzopen64')) {
	function gzopen($filename, $mode, $use_include_path = 0)
	{
		return gzopen64($filename, $mode, $use_include_path);
	}
}

if (!function_exists('gztell') && function_exists('gztell64')) {
	function gztell($zp)
	{
		return gztell64($zp);
	}
}

if (!function_exists('gzseek') && function_exists('gzseek64')) {
	function gzseek($zp, $offset, $whence = SEEK_SET)
	{
		return gzseek64($zp, $offset, $whence);
	}
}

/**
 * Creates a (compressed) Tar archive
 *
 * @package Archive_Tar
 * @author  Vincent Blavet <vincent@phpconcept.net>
 * @license http://www.opensource.org/licenses/bsd-license.php New BSD License
 * @version $Revision$
 */
class ArchiveTar
{
	/**
	 * @var string Name of the Tar
	 */
	public $_tarname = '';

	/**
	 * @var boolean if true, the Tar file will be gzipped
	 */
	public $_compress = false;

	/**
	 * @var string Type of compression : 'none', 'gz', 'bz2' or 'lzma2'
	 */
	public $_compress_type = 'none';

	/**
	 * @var string Explode separator
	 */
	public $_separator = ' ';

	/**
	 * @var resource file descriptor
	 */
	public $_file = 0;

	/**
	 * @var string Local Tar name of a remote Tar (http:// or ftp://)
	 */
	public $_temp_tarname = '';

	/**
	 * @var string regular expression for ignoring files or directories
	 */
	public $_ignore_regexp = '';

	/**
	 * @var object PEAR_Error object
	 */
	public $error_object = null;

	/**
	 * Format for data extraction
	 *
	 * @var string
	 */
	public $_fmt ='';
	/**
	 * Archive_Tar Class constructor. This flavour of the constructor only
	 * declare a new Archive_Tar object, identifying it by the name of the
	 * tar file.
	 * If the compress argument is set the tar will be read or created as a
	 * gzip or bz2 compressed TAR file.
	 *
	 * @param string $p_tarname The name of the tar archive to create
	 * @param string $p_compress can be null, 'gz', 'bz2' or 'lzma2'. This
	 *               parameter indicates if gzip, bz2 or lzma2 compression
	 *               is required.  For compatibility reason the
	 *               boolean value 'true' means 'gz'.
	 *
	 */
	public function __construct($p_tarname, $p_compress = null)
	{
		$this->_compress = false;
		$this->_compress_type = 'none';
		if (($p_compress === null) || ($p_compress == '')) {
			if (@file_exists($p_tarname)) {
				if ($fp = @fopen($p_tarname, "rb")) {
					// look for gzip magic cookie
					$data = fread($fp, 2);
					fclose($fp);
					if ($data == "\37\213") {
						$this->_compress = true;
						$this->_compress_type = 'gz';
						// No sure it's enought for a magic code ....
					} elseif ($data == "BZ") {
						$this->_compress = true;
						$this->_compress_type = 'bz2';
					} elseif (file_get_contents($p_tarname, false, null, 1, 4) == '7zXZ') {
						$this->_compress = true;
						$this->_compress_type = 'lzma2';
					}
				}
			} else {
				// probably a remote file or some file accessible
				// through a stream interface
				if (substr($p_tarname, -2) == 'gz') {
					$this->_compress = true;
					$this->_compress_type = 'gz';
				} elseif ((substr($p_tarname, -3) == 'bz2') ||
					(substr($p_tarname, -2) == 'bz')
				) {
					$this->_compress = true;
					$this->_compress_type = 'bz2';
				} else {
					if (substr($p_tarname, -2) == 'xz') {
						$this->_compress = true;
						$this->_compress_type = 'lzma2';
					}
				}
			}
		} else {
			if (($p_compress === true) || ($p_compress == 'gz')) {
				$this->_compress = true;
				$this->_compress_type = 'gz';
			} else {
				if ($p_compress == 'bz2') {
					$this->_compress = true;
					$this->_compress_type = 'bz2';
				} else {
					if ($p_compress == 'lzma2') {
						$this->_compress = true;
						$this->_compress_type = 'lzma2';
					} else {
						$this->_error(
							"Unsupported compression type '$p_compress'\n" .
							"Supported types are 'gz', 'bz2' and 'lzma2'.\n"
						);
						return;
					}
				}
			}
		}
		$this->_tarname = $p_tarname;

		if (version_compare(PHP_VERSION, "5.5.0-dev") < 0) {
			$this->_fmt = "a100filename/a8mode/a8uid/a8gid/a12size/a12mtime/" .
				"a8checksum/a1typeflag/a100link/a6magic/a2version/" .
				"a32uname/a32gname/a8devmajor/a8devminor/a131prefix";
		} else {
			$this->_fmt = "Z100filename/Z8mode/Z8uid/Z8gid/Z12size/Z12mtime/" .
				"Z8checksum/Z1typeflag/Z100link/Z6magic/Z2version/" .
				"Z32uname/Z32gname/Z8devmajor/Z8devminor/Z131prefix";
		}

	}

	public function __destruct()
	{
		$this->_close();
		// ----- Look for a local copy to delete
		if ($this->_temp_tarname != '') {
			@unlink($this->_temp_tarname);
		}
	}

	/**
	 * This method creates the archive file and add the files / directories
	 * that are listed in $p_filelist.
	 * If a file with the same name exist and is writable, it is replaced
	 * by the new tar.
	 * The method return false and a PEAR error text.
	 * The $p_filelist parameter can be an array of string, each string
	 * representing a filename or a directory name with their path if
	 * needed. It can also be a single string with names separated by a
	 * single blank.
	 * For each directory added in the archive, the files and
	 * sub-directories are also added.
	 * See also createModify() method for more details.
	 *
	 * @param array $p_filelist An array of filenames and directory names, or a
	 *              single string with names separated by a single
	 *              blank space.
	 *
	 * @return true on success, false on error.
	 * @see    createModify()
	 */
	public function create($p_filelist)
	{
		return $this->createModify($p_filelist, '', '');
	}

	/**
	 * This method add the files / directories that are listed in $p_filelist in
	 * the archive. If the archive does not exist it is created.
	 * The method return false and a PEAR error text.
	 * The files and directories listed are only added at the end of the archive,
	 * even if a file with the same name is already archived.
	 * See also createModify() method for more details.
	 *
	 * @param array $p_filelist An array of filenames and directory names, or a
	 *              single string with names separated by a single
	 *              blank space.
	 *
	 * @return true on success, false on error.
	 * @see    createModify()
	 * @access public
	 */
	public function add($p_filelist)
	{
		return $this->addModify($p_filelist, '', '');
	}

	/**
	 * @param string $p_path
	 * @param bool $p_preserve
	 * @return bool
	 */
	public function extract($p_path = '', $p_preserve = false)
	{
		return $this->extractModify($p_path, '', $p_preserve);
	}

	/**
	 * @return array|int
	 */
	public function listContent()
	{
		$v_list_detail = array();

		if ($this->_openRead()) {
			if (!$this->_extractList('', $v_list_detail, "list", '', '')) {
				unset($v_list_detail);
				$v_list_detail = 0;
			}
			$this->_close();
		}

		return $v_list_detail;
	}

	/**
	 * This method creates the archive file and add the files / directories
	 * that are listed in $p_filelist.
	 * If the file already exists and is writable, it is replaced by the
	 * new tar. It is a create and not an add. If the file exists and is
	 * read-only or is a directory it is not replaced. The method return
	 * false and a PEAR error text.
	 * The $p_filelist parameter can be an array of string, each string
	 * representing a filename or a directory name with their path if
	 * needed. It can also be a single string with names separated by a
	 * single blank.
	 * The path indicated in $p_remove_dir will be removed from the
	 * memorized path of each file / directory listed when this path
	 * exists. By default nothing is removed (empty path '')
	 * The path indicated in $p_add_dir will be added at the beginning of
	 * the memorized path of each file / directory listed. However it can
	 * be set to empty ''. The adding of a path is done after the removing
	 * of path.
	 * The path add/remove ability enables the user to prepare an archive
	 * for extraction in a different path than the origin files are.
	 * See also addModify() method for file adding properties.
	 *
	 * @param array $p_filelist An array of filenames and directory names,
	 *                             or a single string with names separated by
	 *                             a single blank space.
	 * @param string $p_add_dir A string which contains a path to be added
	 *                             to the memorized path of each element in
	 *                             the list.
	 * @param string $p_remove_dir A string which contains a path to be
	 *                             removed from the memorized path of each
	 *                             element in the list, when relevant.
	 *
	 * @return boolean true on success, false on error.
	 * @see addModify()
	 */
	public function createModify($p_filelist, $p_add_dir, $p_remove_dir = '')
	{
		$v_result = true;

		if (!$this->_openWrite()) {
			return false;
		}

		if ($p_filelist != '') {
			if (is_array($p_filelist)) {
				$v_list = $p_filelist;
			} elseif (is_string($p_filelist)) {
				$v_list = explode($this->_separator, $p_filelist);
			} else {
				$this->_cleanFile();
				$this->_error('Invalid file list');
				return false;
			}

			$v_result = $this->_addList($v_list, $p_add_dir, $p_remove_dir);
		}

		if ($v_result) {
			$this->_writeFooter();
			$this->_close();
		} else {
			$this->_cleanFile();
		}

		return $v_result;
	}

	/**
	 * This method add the files / directories listed in $p_filelist at the
	 * end of the existing archive. If the archive does not yet exists it
	 * is created.
	 * The $p_filelist parameter can be an array of string, each string
	 * representing a filename or a directory name with their path if
	 * needed. It can also be a single string with names separated by a
	 * single blank.
	 * The path indicated in $p_remove_dir will be removed from the
	 * memorized path of each file / directory listed when this path
	 * exists. By default nothing is removed (empty path '')
	 * The path indicated in $p_add_dir will be added at the beginning of
	 * the memorized path of each file / directory listed. However it can
	 * be set to empty ''. The adding of a path is done after the removing
	 * of path.
	 * The path add/remove ability enables the user to prepare an archive
	 * for extraction in a different path than the origin files are.
	 * If a file/dir is already in the archive it will only be added at the
	 * end of the archive. There is no update of the existing archived
	 * file/dir. However while extracting the archive, the last file will
	 * replace the first one. This results in a none optimization of the
	 * archive size.
	 * If a file/dir does not exist the file/dir is ignored. However an
	 * error text is send to PEAR error.
	 * If a file/dir is not readable the file/dir is ignored. However an
	 * error text is send to PEAR error.
	 *
	 * @param array $p_filelist An array of filenames and directory
	 *                             names, or a single string with names
	 *                             separated by a single blank space.
	 * @param string $p_add_dir A string which contains a path to be
	 *                             added to the memorized path of each
	 *                             element in the list.
	 * @param string $p_remove_dir A string which contains a path to be
	 *                             removed from the memorized path of
	 *                             each element in the list, when
	 *                             relevant.
	 *
	 * @return true on success, false on error.
	 */
	public function addModify($p_filelist, $p_add_dir, $p_remove_dir = '')
	{
		if (!$this->_isArchive()) {
			$v_result = $this->createModify(
				$p_filelist,
				$p_add_dir,
				$p_remove_dir
			);
		} else {
			if (is_array($p_filelist)) {
				$v_list = $p_filelist;
			} elseif (is_string($p_filelist)) {
				$v_list = explode($this->_separator, $p_filelist);
			} else {
				$this->_error('Invalid file list');
				return false;
			}

			$v_result = $this->_append($v_list, $p_add_dir, $p_remove_dir);
		}

		return $v_result;
	}

	/**
	 * This method add a single string as a file at the
	 * end of the existing archive. If the archive does not yet exists it
	 * is created.
	 *
	 * @param string $p_filename A string which contains the full
	 *                           filename path that will be associated
	 *                           with the string.
	 * @param string $p_string The content of the file added in
	 *                           the archive.
	 * @param bool|int $p_datetime A custom date/time (unix timestamp)
	 *                           for the file (optional).
	 * @param array $p_params An array of optional params:
	 *                               stamp => the datetime (replaces
	 *                                   datetime above if it exists)
	 *                               mode => the permissions on the
	 *                                   file (600 by default)
	 *                               type => is this a link?  See the
	 *                                   tar specification for details.
	 *                                   (default = regular file)
	 *                               uid => the user ID of the file
	 *                                   (default = 0 = root)
	 *                               gid => the group ID of the file
	 *                                   (default = 0 = root)
	 *
	 * @return true on success, false on error.
	 */
	public function addString($p_filename, $p_string, $p_datetime = false, $p_params = array())
	{
		if (!$this->_isArchive()) {
			if (!$this->_openWrite()) {
				return false;
			}
			$this->_close();
		}

		if (!$this->_openAppend()) {
			return false;
		}

		// Need to check the get back to the temporary file ? ....
		$v_result = $this->_addString($p_filename, $p_string, $p_datetime, $p_params);

		$this->_writeFooter();

		$this->_close();

		return $v_result;
	}

	/**
	 * This method extract all the content of the archive in the directory
	 * indicated by $p_path. When relevant the memorized path of the
	 * files/dir can be modified by removing the $p_remove_path path at the
	 * beginning of the file/dir path.
	 * While extracting a file, if the directory path does not exists it is
	 * created.
	 * While extracting a file, if the file already exists it is replaced
	 * without looking for last modification date.
	 * While extracting a file, if the file already exists and is write
	 * protected, the extraction is aborted.
	 * While extracting a file, if a directory with the same name already
	 * exists, the extraction is aborted.
	 * While extracting a directory, if a file with the same name already
	 * exists, the extraction is aborted.
	 * While extracting a file/directory if the destination directory exist
	 * and is write protected, or does not exist but can not be created,
	 * the extraction is aborted.
	 * If after extraction an extracted file does not show the correct
	 * stored file size, the extraction is aborted.
	 * When the extraction is aborted, a PEAR error text is set and false
	 * is returned. However the result can be a partial extraction that may
	 * need to be manually cleaned.
	 *
	 * @param string $p_path The path of the directory where the
	 *                               files/dir need to by extracted.
	 * @param string $p_remove_path Part of the memorized path that can be
	 *                               removed if present at the beginning of
	 *                               the file/dir path.
	 * @param boolean $p_preserve Preserve user/group ownership of files
	 *
	 * @return boolean true on success, false on error.
	 * @see    extractList()
	 */
	public function extractModify($p_path, $p_remove_path, $p_preserve = false)
	{
		$v_list_detail = array();

		if ($v_result = $this->_openRead()) {
			$v_result = $this->_extractList(
				$p_path,
				$v_list_detail,
				"complete",
				0,
				$p_remove_path,
				$p_preserve
			);
			$this->_close();
		}

		return $v_result;
	}

	/**
	 * This method extract from the archive one file identified by $p_filename.
	 * The return value is a string with the file content, or NULL on error.
	 *
	 * @param string $p_filename The path of the file to extract in a string.
	 *
	 * @return string with the file content or NULL.
	 */
	public function extractInString($p_filename)
	{
		if ($this->_openRead()) {
			$v_result = $this->_extractInString($p_filename);
			$this->_close();
		} else {
			$v_result = null;
		}

		return $v_result;
	}

	/**
	 * This method extract from the archive only the files indicated in the
	 * $p_filelist. These files are extracted in the current directory or
	 * in the directory indicated by the optional $p_path parameter.
	 * If indicated the $p_remove_path can be used in the same way as it is
	 * used in extractModify() method.
	 *
	 * @param array|string $p_filelist An array of filenames and directory names,
	 *                               or a single string with names separated
	 *                               by a single blank space.
	 * @param string $p_path The path of the directory where the
	 *                               files/dir need to by extracted.
	 * @param string $p_remove_path Part of the memorized path that can be
	 *                               removed if present at the beginning of
	 *                               the file/dir path.
	 * @param boolean $p_preserve Preserve user/group ownership of files
	 *
	 * @return true on success, false on error.
	 * @see    extractModify()
	 */
	public function extractList($p_filelist, $p_path = '', $p_remove_path = '', $p_preserve = false)
	{
		$v_list_detail = array();

		if (is_array($p_filelist)) {
			$v_list = $p_filelist;
		} elseif (is_string($p_filelist)) {
			$v_list = explode($this->_separator, $p_filelist);
		} else {
			$this->_error('Invalid string list');
			return false;
		}

		if ($v_result = $this->_openRead()) {
			$v_result = $this->_extractList(
				$p_path,
				$v_list_detail,
				"partial",
				$v_list,
				$p_remove_path,
				$p_preserve
			);
			$this->_close();
		}

		return $v_result;
	}

	/**
	 * This method set specific attributes of the archive. It uses a variable
	 * list of parameters, in the format attribute code + attribute values :
	 * $arch->setAttribute(ARCHIVE_TAR_ATT_SEPARATOR, ',');
	 *
	 * @return true on success, false on error.
	 */
	public function setAttribute()
	{
		$v_result = true;

		// ----- Get the number of variable list of arguments
		if (($v_size = func_num_args()) == 0) {
			return true;
		}

		// ----- Get the arguments
		$v_att_list = func_get_args();

		// ----- Read the attributes
		$i = 0;
		while ($i < $v_size) {

			// ----- Look for next option
			switch ($v_att_list[$i]) {
				// ----- Look for options that request a string value
				case ARCHIVE_TAR_ATT_SEPARATOR :
					// ----- Check the number of parameters
					if (($i + 1) >= $v_size) {
						$this->_error(
							'Invalid number of parameters for '
							. 'attribute ARCHIVE_TAR_ATT_SEPARATOR'
						);
						return false;
					}

					// ----- Get the value
					$this->_separator = $v_att_list[$i + 1];
					$i++;
					break;

				default :
					$this->_error('Unknown attribute code ' . $v_att_list[$i] . '');
					return false;
			}

			// ----- Next attribute
			$i++;
		}

		return $v_result;
	}

	/**
	 * This method sets the regular expression for ignoring files and directories
	 * at import, for example:
	 * $arch->setIgnoreRegexp("#CVS|\.svn#");
	 *
	 * @param string $regexp regular expression defining which files or directories to ignore
	 */
	public function setIgnoreRegexp($regexp)
	{
		$this->_ignore_regexp = $regexp;
	}

	/**
	 * This method sets the regular expression for ignoring all files and directories
	 * matching the filenames in the array list at import, for example:
	 * $arch->setIgnoreList(array('CVS', '.svn', 'bin/tool'));
	 *
	 * @param array $list a list of file or directory names to ignore
	 *
	 * @access public
	 */
	public function setIgnoreList($list)
	{
		//$regexp = str_replace(array('#', '.', '^', '$'), array('\#', '\.', '\^', '\$'), $list);
		$regexp = '#/' . join('$|/', $list) . '#';
		$this->setIgnoreRegexp($regexp);
	}

	/**
	 * @param string $p_message
	 */
	public function _error($p_message)
	{
		IssueLog::Error($p_message);
	}

	/**
	 * @param string $p_message
	 */
	public function _warning($p_message)
	{
		IssueLog::Warning($p_message);
	}

	/**
	 * @param string $p_filename
	 * @return bool
	 */
	public function _isArchive($p_filename = null)
	{
		if ($p_filename == null) {
			$p_filename = $this->_tarname;
		}
		clearstatcache();
		return @is_file($p_filename) && !@is_link($p_filename);
	}

	/**
	 * @return bool
	 */
	public function _openWrite()
	{
		if ($this->_compress_type == 'gz' && function_exists('gzopen')) {
			$this->_file = @gzopen($this->_tarname, "wb9");
		} else {
			if ($this->_compress_type == 'bz2' && function_exists('bzopen')) {
				$this->_file = @bzopen($this->_tarname, "w");
			} else {
				if ($this->_compress_type == 'lzma2' && function_exists('xzopen')) {
					$this->_file = @xzopen($this->_tarname, 'w');
				} else {
					if ($this->_compress_type == 'none') {
						$this->_file = @fopen($this->_tarname, "wb");
					} else {
						$this->_error(
							'Unknown or missing compression type ('
							. $this->_compress_type . ')'
						);
						return false;
					}
				}
			}
		}

		if ($this->_file == 0) {
			$this->_error(
				'Unable to open in write mode \''
				. $this->_tarname . '\''
			);
			return false;
		}

		return true;
	}

	/**
	 * @return bool
	 */
	public function _openRead()
	{
		if (strtolower(substr($this->_tarname, 0, 7)) == 'http://') {

			// ----- Look if a local copy need to be done
			if ($this->_temp_tarname == '') {
				$this->_temp_tarname = uniqid('tar') . '.tmp';
				if (!$v_file_from = @fopen($this->_tarname, 'rb')) {
					$this->_error(
						'Unable to open in read mode \''
						. $this->_tarname . '\''
					);
					$this->_temp_tarname = '';
					return false;
				}
				if (!$v_file_to = @fopen($this->_temp_tarname, 'wb')) {
					$this->_error(
						'Unable to open in write mode \''
						. $this->_temp_tarname . '\''
					);
					$this->_temp_tarname = '';
					return false;
				}
				while ($v_data = @fread($v_file_from, 1024)) {
					@fwrite($v_file_to, $v_data);
				}
				@fclose($v_file_from);
				@fclose($v_file_to);
			}

			// ----- File to open if the local copy
			$v_filename = $this->_temp_tarname;
		} else {
			// ----- File to open if the normal Tar file

			$v_filename = $this->_tarname;
		}

		if ($this->_compress_type == 'gz' && function_exists('gzopen')) {
			$this->_file = @gzopen($v_filename, "rb");
		} else {
			if ($this->_compress_type == 'bz2' && function_exists('bzopen')) {
				$this->_file = @bzopen($v_filename, "r");
			} else {
				if ($this->_compress_type == 'lzma2' && function_exists('xzopen')) {
					$this->_file = @xzopen($v_filename, "r");
				} else {
					if ($this->_compress_type == 'none') {
						$this->_file = @fopen($v_filename, "rb");
					} else {
						$this->_error(
							'Unknown or missing compression type ('
							. $this->_compress_type . ')'
						);
						return false;
					}
				}
			}
		}

		if ($this->_file == 0) {
			$this->_error('Unable to open in read mode \'' . $v_filename . '\'');
			return false;
		}

		return true;
	}

	/**
	 * @return bool
	 */
	public function _openReadWrite()
	{
		if ($this->_compress_type == 'gz') {
			$this->_file = @gzopen($this->_tarname, "r+b");
		} else {
			if ($this->_compress_type == 'bz2') {
				$this->_error(
					'Unable to open bz2 in read/write mode \''
					. $this->_tarname . '\' (limitation of bz2 extension)'
				);
				return false;
			} else {
				if ($this->_compress_type == 'lzma2') {
					$this->_error(
						'Unable to open lzma2 in read/write mode \''
						. $this->_tarname . '\' (limitation of lzma2 extension)'
					);
					return false;
				} else {
					if ($this->_compress_type == 'none') {
						$this->_file = @fopen($this->_tarname, "r+b");
					} else {
						$this->_error(
							'Unknown or missing compression type ('
							. $this->_compress_type . ')'
						);
						return false;
					}
				}
			}
		}

		if ($this->_file == 0) {
			$this->_error(
				'Unable to open in read/write mode \''
				. $this->_tarname . '\''
			);
			return false;
		}

		return true;
	}

	/**
	 * @return bool
	 */
	public function _close()
	{
		//if (isset($this->_file)) {
		if (is_resource($this->_file)) {
			if ($this->_compress_type == 'gz') {
				@gzclose($this->_file);
			} else {
				if ($this->_compress_type == 'bz2') {
					@bzclose($this->_file);
				} else {
					if ($this->_compress_type == 'lzma2') {
						@xzclose($this->_file);
					} else {
						if ($this->_compress_type == 'none') {
							@fclose($this->_file);
						} else {
							$this->_error(
								'Unknown or missing compression type ('
								. $this->_compress_type . ')'
							);
						}
					}
				}
			}

			$this->_file = 0;
		}

		// ----- Look if a local copy need to be erase
		// Note that it might be interesting to keep the url for a time.
		if ($this->_temp_tarname != '') {
			@unlink($this->_temp_tarname);
			$this->_temp_tarname = '';
		}

		return true;
	}

	/**
	 * @return bool
	 */
	public function _cleanFile()
	{
		$this->_close();

		// ----- Look for a local copy
		if ($this->_temp_tarname != '') {
			// ----- Remove the local copy but not the remote tarname
			@unlink($this->_temp_tarname);
			$this->_temp_tarname = '';
		} else {
			// ----- Remove the local tarname file
			@unlink($this->_tarname);
		}
		$this->_tarname = '';

		return true;
	}

	/**
	 * @param mixed $p_binary_data
	 * @param integer $p_len
	 * @return bool
	 */
	public function _writeBlock($p_binary_data, $p_len = null)
	{
		if (is_resource($this->_file)) {
			if ($p_len === null) {
				if ($this->_compress_type == 'gz') {
					@gzputs($this->_file, $p_binary_data);
				} else {
					if ($this->_compress_type == 'bz2') {
						@bzwrite($this->_file, $p_binary_data);
					} else {
						if ($this->_compress_type == 'lzma2') {
							@xzwrite($this->_file, $p_binary_data);
						} else {
							if ($this->_compress_type == 'none') {
								@fputs($this->_file, $p_binary_data);
							} else {
								$this->_error(
									'Unknown or missing compression type ('
									. $this->_compress_type . ')'
								);
							}
						}
					}
				}
			} else {
				if ($this->_compress_type == 'gz') {
					@gzputs($this->_file, $p_binary_data, $p_len);
				} else {
					if ($this->_compress_type == 'bz2') {
						@bzwrite($this->_file, $p_binary_data, $p_len);
					} else {
						if ($this->_compress_type == 'lzma2') {
							@xzwrite($this->_file, $p_binary_data, $p_len);
						} else {
							if ($this->_compress_type == 'none') {
								@fputs($this->_file, $p_binary_data, $p_len);
							} else {
								$this->_error(
									'Unknown or missing compression type ('
									. $this->_compress_type . ')'
								);
							}
						}
					}
				}
			}
		}
		return true;
	}

	/**
	 * @return null|string
	 */
	public function _readBlock()
	{
		$v_block = null;
		if (is_resource($this->_file)) {
			if ($this->_compress_type == 'gz') {
				$v_block = @gzread($this->_file, 512);
			} else {
				if ($this->_compress_type == 'bz2') {
					$v_block = @bzread($this->_file, 512);
				} else {
					if ($this->_compress_type == 'lzma2') {
						$v_block = @xzread($this->_file, 512);
					} else {
						if ($this->_compress_type == 'none') {
							$v_block = @fread($this->_file, 512);
						} else {
							$this->_error(
								'Unknown or missing compression type ('
								. $this->_compress_type . ')'
							);
						}
					}
				}
			}
		}
		return $v_block;
	}

	/**
	 * @param null $p_len
	 * @return bool
	 */
	public function _jumpBlock($p_len = null)
	{
		if (is_resource($this->_file)) {
			if ($p_len === null) {
				$p_len = 1;
			}

			if ($this->_compress_type == 'gz') {
				@gzseek($this->_file, gztell($this->_file) + ($p_len * 512));
			} else {
				if ($this->_compress_type == 'bz2') {
					// ----- Replace missing bztell() and bzseek()
					for ($i = 0; $i < $p_len; $i++) {
						$this->_readBlock();
					}
				} else {
					if ($this->_compress_type == 'lzma2') {
						// ----- Replace missing xztell() and xzseek()
						for ($i = 0; $i < $p_len; $i++) {
							$this->_readBlock();
						}
					} else {
						if ($this->_compress_type == 'none') {
							@fseek($this->_file, $p_len * 512, SEEK_CUR);
						} else {
							$this->_error(
								'Unknown or missing compression type ('
								. $this->_compress_type . ')'
							);
						}
					}
				}
			}
		}
		return true;
	}

	/**
	 * @return bool
	 */
	public function _writeFooter()
	{
		if (is_resource($this->_file)) {
			// ----- Write the last 0 filled block for end of archive
			$v_binary_data = pack('a1024', '');
			$this->_writeBlock($v_binary_data);
		}
		return true;
	}

	/**
	 * @param array $p_list
	 * @param string $p_add_dir
	 * @param string $p_remove_dir
	 * @return bool
	 */
	public function _addList($p_list, $p_add_dir, $p_remove_dir)
	{
		$v_result = true;
		$v_header = array();

		// ----- Remove potential windows directory separator
		$p_add_dir = $this->_translateWinPath($p_add_dir);
		$p_remove_dir = $this->_translateWinPath($p_remove_dir, false);

		if (!$this->_file) {
			$this->_error('Invalid file descriptor');
			return false;
		}

		if (sizeof($p_list) == 0) {
			return true;
		}

		foreach ($p_list as $v_filename) {
			if (!$v_result) {
				break;
			}

			// ----- Skip the current tar name
			if ($v_filename == $this->_tarname) {
				continue;
			}

			if ($v_filename == '') {
				continue;
			}

			// ----- ignore files and directories matching the ignore regular expression
			if ($this->_ignore_regexp && preg_match($this->_ignore_regexp, '/' . $v_filename)) {
				$this->_warning("File '$v_filename' ignored");
				continue;
			}

			if (!file_exists($v_filename) && !is_link($v_filename)) {
				$this->_warning("File '$v_filename' does not exist");
				continue;
			}

			// ----- Add the file or directory header
			if (!$this->_addFile($v_filename, $v_header, $p_add_dir, $p_remove_dir)) {
				return false;
			}

			if (@is_dir($v_filename) && !@is_link($v_filename)) {
				if (!($p_hdir = opendir($v_filename))) {
					$this->_warning("Directory '$v_filename' can not be read");
					continue;
				}
				while (false !== ($p_hitem = readdir($p_hdir))) {
					if (($p_hitem != '.') && ($p_hitem != '..')) {
						if ($v_filename != ".") {
							$p_temp_list[0] = $v_filename . '/' . $p_hitem;
						} else {
							$p_temp_list[0] = $p_hitem;
						}

						$v_result = $this->_addList(
							$p_temp_list,
							$p_add_dir,
							$p_remove_dir
						);
					}
				}

				unset($p_temp_list);
				unset($p_hdir);
				unset($p_hitem);
			}
		}

		return $v_result;
	}

	/**
	 * @param string $p_filename
	 * @param mixed $p_header
	 * @param string $p_add_dir
	 * @param string $p_remove_dir
	 * @param null $v_stored_filename
	 * @return bool
	 */
	public function _addFile($p_filename, &$p_header, $p_add_dir, $p_remove_dir, $v_stored_filename = null)
	{
		if (!$this->_file) {
			$this->_error('Invalid file descriptor');
			return false;
		}

		if ($p_filename == '') {
			$this->_error('Invalid file name');
			return false;
		}

		if (is_null($v_stored_filename)) {
			// ----- Calculate the stored filename
			$p_filename = $this->_translateWinPath($p_filename, false);
			$v_stored_filename = $p_filename;

			if (strcmp($p_filename, $p_remove_dir) == 0) {
				return true;
			}

			if ($p_remove_dir != '') {
				if (substr($p_remove_dir, -1) != '/') {
					$p_remove_dir .= '/';
				}

				if (substr($p_filename, 0, strlen($p_remove_dir)) == $p_remove_dir) {
					$v_stored_filename = substr($p_filename, strlen($p_remove_dir));
				}
			}

			$v_stored_filename = $this->_translateWinPath($v_stored_filename);
			if ($p_add_dir != '') {
				if (substr($p_add_dir, -1) == '/') {
					$v_stored_filename = $p_add_dir . $v_stored_filename;
				} else {
					$v_stored_filename = $p_add_dir . '/' . $v_stored_filename;
				}
			}

			$v_stored_filename = $this->_pathReduction($v_stored_filename);
		}

		if ($this->_isArchive($p_filename)) {
			if (($v_file = @fopen($p_filename, "rb")) == 0) {
				$this->_warning(
					"Unable to open file '" . $p_filename
					. "' in binary read mode"
				);
				return true;
			}

			if (!$this->_writeHeader($p_filename, $v_stored_filename)) {
				return false;
			}

			$iLen = 1024*1024;
			while (($v_buffer = fread($v_file, $iLen)) != '') {
				$iBufferLen = strlen("$v_buffer");
				if ($iBufferLen != $iLen)
				{
					$iPack = (ceil($iBufferLen / 512)) * 512;
					$sPack = sprintf('a%d', $iPack);
				}
				else
				{
					$sPack = sprintf('a%d', $iLen);
				}
				$v_binary_data = pack($sPack, "$v_buffer");
				$this->_writeBlock($v_binary_data);
			}

			fclose($v_file);
		} else {
			// ----- Only header for dir
			if (!$this->_writeHeader($p_filename, $v_stored_filename)) {
				return false;
			}
		}

		return true;
	}

	/**
	 * @param string $p_filename
	 * @param string $p_string
	 * @param bool $p_datetime
	 * @param array $p_params
	 * @return bool
	 */
	public function _addString($p_filename, $p_string, $p_datetime = false, $p_params = array())
	{
		$p_stamp = @$p_params["stamp"] ? $p_params["stamp"] : ($p_datetime ? $p_datetime : time());
		$p_mode = @$p_params["mode"] ? $p_params["mode"] : 0600;
		$p_type = @$p_params["type"] ? $p_params["type"] : "";
		$p_uid = @$p_params["uid"] ? $p_params["uid"] : 0;
		$p_gid = @$p_params["gid"] ? $p_params["gid"] : 0;
		if (!$this->_file) {
			$this->_error('Invalid file descriptor');
			return false;
		}

		if ($p_filename == '') {
			$this->_error('Invalid file name');
			return false;
		}

		// ----- Calculate the stored filename
		$p_filename = $this->_translateWinPath($p_filename, false);

		if (!$this->_writeHeaderBlock(
			$p_filename,
			strlen($p_string),
			$p_stamp,
			$p_mode,
			$p_type,
			$p_uid,
			$p_gid
		)
		) {
			return false;
		}

		$i = 0;
		while (($v_buffer = substr($p_string, (($i++) * 512), 512)) != '') {
			$v_binary_data = pack("a512", $v_buffer);
			$this->_writeBlock($v_binary_data);
		}

		return true;
	}

	/**
	 * @param string $p_filename
	 * @param string $p_stored_filename
	 * @return bool
	 */
	public function _writeHeader($p_filename, $p_stored_filename)
	{
		if ($p_stored_filename == '') {
			$p_stored_filename = $p_filename;
		}
		$v_reduce_filename = $this->_pathReduction($p_stored_filename);

		if (strlen($v_reduce_filename) > 99) {
			if (!$this->_writeLongHeader($v_reduce_filename)) {
				return false;
			}
		}

		$v_info = lstat($p_filename);
		$v_uid = sprintf("%07s", DecOct($v_info[4]));
		$v_gid = sprintf("%07s", DecOct($v_info[5]));
		$v_perms = sprintf("%07s", DecOct($v_info['mode'] & 000777));

		$v_mtime = sprintf("%011s", DecOct($v_info['mtime']));

		$v_linkname = '';

		if (@is_link($p_filename)) {
			$v_typeflag = '2';
			$v_linkname = readlink($p_filename);
			$v_size = sprintf("%011s", DecOct(0));
		} elseif (@is_dir($p_filename)) {
			$v_typeflag = "5";
			$v_size = sprintf("%011s", DecOct(0));
		} else {
			$v_typeflag = '0';
			clearstatcache();
			$v_size = sprintf("%011s", DecOct($v_info['size']));
		}

		$v_magic = 'ustar ';

		$v_version = ' ';

		if (function_exists('posix_getpwuid')) {
			$userinfo = posix_getpwuid($v_info[4]);
			$groupinfo = posix_getgrgid($v_info[5]);

			$v_uname = $userinfo['name'];
			$v_gname = $groupinfo['name'];
		} else {
			$v_uname = '';
			$v_gname = '';
		}

		$v_devmajor = '';

		$v_devminor = '';

		$v_prefix = '';

		$v_binary_data_first = pack(
			"a100a8a8a8a12a12",
			$v_reduce_filename,
			$v_perms,
			$v_uid,
			$v_gid,
			$v_size,
			$v_mtime
		);
		$v_binary_data_last = pack(
			"a1a100a6a2a32a32a8a8a155a12",
			$v_typeflag,
			$v_linkname,
			$v_magic,
			$v_version,
			$v_uname,
			$v_gname,
			$v_devmajor,
			$v_devminor,
			$v_prefix,
			''
		);

		// ----- Calculate the checksum
		$v_checksum = 0;
		// ..... First part of the header
		for ($i = 0; $i < 148; $i++) {
			$v_checksum += ord(substr($v_binary_data_first, $i, 1));
		}
		// ..... Ignore the checksum value and replace it by ' ' (space)
		for ($i = 148; $i < 156; $i++) {
			$v_checksum += ord(' ');
		}
		// ..... Last part of the header
		for ($i = 156, $j = 0; $i < 512; $i++, $j++) {
			$v_checksum += ord(substr($v_binary_data_last, $j, 1));
		}

		// ----- Write the first 148 bytes of the header in the archive
		$this->_writeBlock($v_binary_data_first, 148);

		// ----- Write the calculated checksum
		$v_checksum = sprintf("%06s ", DecOct($v_checksum));
		$v_binary_data = pack("a8", $v_checksum);
		$this->_writeBlock($v_binary_data, 8);

		// ----- Write the last 356 bytes of the header in the archive
		$this->_writeBlock($v_binary_data_last, 356);

		return true;
	}

	/**
	 * @param string $p_filename
	 * @param int $p_size
	 * @param int $p_mtime
	 * @param int $p_perms
	 * @param string $p_type
	 * @param int $p_uid
	 * @param int $p_gid
	 * @return bool
	 */
	public function _writeHeaderBlock(
		$p_filename,
		$p_size,
		$p_mtime = 0,
		$p_perms = 0,
		$p_type = '',
		$p_uid = 0,
		$p_gid = 0
	) {
		$p_filename = $this->_pathReduction($p_filename);

		if (strlen($p_filename) > 99) {
			if (!$this->_writeLongHeader($p_filename)) {
				return false;
			}
		}

		if ($p_type == "5") {
			$v_size = sprintf("%011s", DecOct(0));
		} else {
			$v_size = sprintf("%011s", DecOct($p_size));
		}

		$v_uid = sprintf("%07s", DecOct($p_uid));
		$v_gid = sprintf("%07s", DecOct($p_gid));
		$v_perms = sprintf("%07s", DecOct($p_perms & 000777));

		$v_mtime = sprintf("%11s", DecOct($p_mtime));

		$v_linkname = '';

		$v_magic = 'ustar ';

		$v_version = ' ';

		if (function_exists('posix_getpwuid')) {
			$userinfo = posix_getpwuid($p_uid);
			$groupinfo = posix_getgrgid($p_gid);

			$v_uname = $userinfo['name'];
			$v_gname = $groupinfo['name'];
		} else {
			$v_uname = '';
			$v_gname = '';
		}

		$v_devmajor = '';

		$v_devminor = '';

		$v_prefix = '';

		$v_binary_data_first = pack(
			"a100a8a8a8a12A12",
			$p_filename,
			$v_perms,
			$v_uid,
			$v_gid,
			$v_size,
			$v_mtime
		);
		$v_binary_data_last = pack(
			"a1a100a6a2a32a32a8a8a155a12",
			$p_type,
			$v_linkname,
			$v_magic,
			$v_version,
			$v_uname,
			$v_gname,
			$v_devmajor,
			$v_devminor,
			$v_prefix,
			''
		);

		// ----- Calculate the checksum
		$v_checksum = 0;
		// ..... First part of the header
		for ($i = 0; $i < 148; $i++) {
			$v_checksum += ord(substr($v_binary_data_first, $i, 1));
		}
		// ..... Ignore the checksum value and replace it by ' ' (space)
		for ($i = 148; $i < 156; $i++) {
			$v_checksum += ord(' ');
		}
		// ..... Last part of the header
		for ($i = 156, $j = 0; $i < 512; $i++, $j++) {
			$v_checksum += ord(substr($v_binary_data_last, $j, 1));
		}

		// ----- Write the first 148 bytes of the header in the archive
		$this->_writeBlock($v_binary_data_first, 148);

		// ----- Write the calculated checksum
		$v_checksum = sprintf("%06s ", DecOct($v_checksum));
		$v_binary_data = pack("a8", $v_checksum);
		$this->_writeBlock($v_binary_data, 8);

		// ----- Write the last 356 bytes of the header in the archive
		$this->_writeBlock($v_binary_data_last, 356);

		return true;
	}

	/**
	 * @param string $p_filename
	 * @return bool
	 */
	public function _writeLongHeader($p_filename)
	{
		$v_size = sprintf("%11s ", DecOct(strlen($p_filename)));

		$v_typeflag = 'L';

		$v_linkname = '';

		$v_magic = '';

		$v_version = '';

		$v_uname = '';

		$v_gname = '';

		$v_devmajor = '';

		$v_devminor = '';

		$v_prefix = '';

		$v_binary_data_first = pack(
			"a100a8a8a8a12a12",
			'././@LongLink',
			0,
			0,
			0,
			$v_size,
			0
		);
		$v_binary_data_last = pack(
			"a1a100a6a2a32a32a8a8a155a12",
			$v_typeflag,
			$v_linkname,
			$v_magic,
			$v_version,
			$v_uname,
			$v_gname,
			$v_devmajor,
			$v_devminor,
			$v_prefix,
			''
		);

		// ----- Calculate the checksum
		$v_checksum = 0;
		// ..... First part of the header
		for ($i = 0; $i < 148; $i++) {
			$v_checksum += ord(substr($v_binary_data_first, $i, 1));
		}
		// ..... Ignore the checksum value and replace it by ' ' (space)
		for ($i = 148; $i < 156; $i++) {
			$v_checksum += ord(' ');
		}
		// ..... Last part of the header
		for ($i = 156, $j = 0; $i < 512; $i++, $j++) {
			$v_checksum += ord(substr($v_binary_data_last, $j, 1));
		}

		// ----- Write the first 148 bytes of the header in the archive
		$this->_writeBlock($v_binary_data_first, 148);

		// ----- Write the calculated checksum
		$v_checksum = sprintf("%06s ", DecOct($v_checksum));
		$v_binary_data = pack("a8", $v_checksum);
		$this->_writeBlock($v_binary_data, 8);

		// ----- Write the last 356 bytes of the header in the archive
		$this->_writeBlock($v_binary_data_last, 356);

		// ----- Write the filename as content of the block
		$i = 0;
		while (($v_buffer = substr($p_filename, (($i++) * 512), 512)) != '') {
			$v_binary_data = pack("a512", "$v_buffer");
			$this->_writeBlock($v_binary_data);
		}

		return true;
	}

	/**
	 * @param mixed $v_binary_data
	 * @param mixed $v_header
	 * @return bool
	 */
	public function _readHeader($v_binary_data, &$v_header)
	{
		if (strlen($v_binary_data) == 0) {
			$v_header['filename'] = '';
			return true;
		}

		if (strlen($v_binary_data) != 512) {
			$v_header['filename'] = '';
			$this->_error('Invalid block size : ' . strlen($v_binary_data));
			return false;
		}

		if (!is_array($v_header)) {
			$v_header = array();
		}
		// ----- Calculate the checksum
		$v_checksum = 0;
		// ..... First part of the header
		$v_binary_split = str_split($v_binary_data);
		$v_checksum += array_sum(array_map('ord', array_slice($v_binary_split, 0, 148)));
		$v_checksum += array_sum(array_map('ord', array(' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ',)));
		$v_checksum += array_sum(array_map('ord', array_slice($v_binary_split, 156, 512)));


		$v_data = unpack($this->_fmt, $v_binary_data);

		if (strlen($v_data["prefix"]) > 0) {
			$v_data["filename"] = "$v_data[prefix]/$v_data[filename]";
		}

		// ----- Extract the checksum
		$v_header['checksum'] = OctDec(trim($v_data['checksum']));
		if ($v_header['checksum'] != $v_checksum) {
			$v_header['filename'] = '';

			// ----- Look for last block (empty block)
			if (($v_checksum == 256) && ($v_header['checksum'] == 0)) {
				return true;
			}

			$this->_error(
				'Invalid checksum for file "' . $v_data['filename']
				. '" : ' . $v_checksum . ' calculated, '
				. $v_header['checksum'] . ' expected'
			);
			return false;
		}

		// ----- Extract the properties
		$v_header['filename'] = rtrim($v_data['filename'], "\0");
		if ($this->_maliciousFilename($v_header['filename'])) {
			$this->_error(
				'Malicious .tar detected, file "' . $v_header['filename'] .
				'" will not install in desired directory tree'
			);
			return false;
		}
		$v_header['mode'] = OctDec(trim($v_data['mode']));
		$v_header['uid'] = OctDec(trim($v_data['uid']));
		$v_header['gid'] = OctDec(trim($v_data['gid']));
		$v_header['size'] = $this->_tarRecToSize($v_data['size']);
		$v_header['mtime'] = OctDec(trim($v_data['mtime']));
		if (($v_header['typeflag'] = $v_data['typeflag']) == "5") {
			$v_header['size'] = 0;
		}
		$v_header['link'] = trim($v_data['link']);
		/* ----- All these fields are removed form the header because
		they do not carry interesting info
		$v_header[magic] = trim($v_data[magic]);
		$v_header[version] = trim($v_data[version]);
		$v_header[uname] = trim($v_data[uname]);
		$v_header[gname] = trim($v_data[gname]);
		$v_header[devmajor] = trim($v_data[devmajor]);
		$v_header[devminor] = trim($v_data[devminor]);
		*/

		return true;
	}

	/**
	 * Convert Tar record size to actual size
	 *
	 * @param string $tar_size
	 * @return float|int size of tar record in bytes
	 */
	private function _tarRecToSize($tar_size)
	{
		/*
		 * First byte of size has a special meaning if bit 7 is set.
		 *
		 * Bit 7 indicates base-256 encoding if set.
		 * Bit 6 is the sign bit.
		 * Bits 5:0 are most significant value bits.
		 */
		$ch = ord($tar_size[0]);
		if ($ch & 0x80) {
			// Full 12-bytes record is required.
			$rec_str = $tar_size . "\x00";

			$size = ($ch & 0x40) ? -1 : 0;
			$size = ($size << 6) | ($ch & 0x3f);

			for ($num_ch = 1; $num_ch < 12; ++$num_ch) {
				$size = ($size * 256) + ord($rec_str[$num_ch]);
			}

			return $size;

		} else {
			return OctDec(trim($tar_size));
		}
	}

	/**
	 * Detect and report a malicious file name
	 *
	 * @param string $file
	 *
	 * @return bool
	 */
	private function _maliciousFilename($file)
	{
		if (strpos($file, '/../') !== false) {
			return true;
		}
		if (strpos($file, '../') === 0) {
			return true;
		}
		return false;
	}

	/**
	 * @param $v_header
	 * @return bool
	 */
	public function _readLongHeader(&$v_header)
	{
		$v_filename = '';
		$v_filesize = $v_header['size'];
		$n = floor($v_header['size'] / 512);
		for ($i = 0; $i < $n; $i++) {
			$v_content = $this->_readBlock();
			$v_filename .= $v_content;
		}
		if (($v_header['size'] % 512) != 0) {
			$v_content = $this->_readBlock();
			$v_filename .= $v_content;
		}

		// ----- Read the next header
		$v_binary_data = $this->_readBlock();

		if (!$this->_readHeader($v_binary_data, $v_header)) {
			return false;
		}

		$v_filename = rtrim(substr($v_filename, 0, $v_filesize), "\0");
		$v_header['filename'] = $v_filename;
		if ($this->_maliciousFilename($v_filename)) {
			$this->_error(
				'Malicious .tar detected, file "' . $v_filename .
				'" will not install in desired directory tree'
			);
			return false;
		}

		return true;
	}

	/**
	 * This method extract from the archive one file identified by $p_filename.
	 * The return value is a string with the file content, or null on error.
	 *
	 * @param string $p_filename The path of the file to extract in a string.
	 *
	 * @return string with the file content or null.
	 */
	private function _extractInString($p_filename)
	{
		$v_result_str = "";

		while (strlen($v_binary_data = $this->_readBlock()) != 0) {
			if (!$this->_readHeader($v_binary_data, $v_header)) {
				return null;
			}

			if ($v_header['filename'] == '') {
				continue;
			}

			// ----- Look for long filename
			if ($v_header['typeflag'] == 'L') {
				if (!$this->_readLongHeader($v_header)) {
					return null;
				}
			}

			if ($v_header['filename'] == $p_filename) {
				if ($v_header['typeflag'] == "5") {
					$this->_error(
						'Unable to extract in string a directory '
						. 'entry {' . $v_header['filename'] . '}'
					);
					return null;
				} else {
					$n = floor($v_header['size'] / 512);
					for ($i = 0; $i < $n; $i++) {
						$v_result_str .= $this->_readBlock();
					}
					if (($v_header['size'] % 512) != 0) {
						$v_content = $this->_readBlock();
						$v_result_str .= substr(
							$v_content,
							0,
							($v_header['size'] % 512)
						);
					}
					return $v_result_str;
				}
			} else {
				$this->_jumpBlock(ceil(($v_header['size'] / 512)));
			}
		}

		return null;
	}

	/**
	 * @param string $p_path
	 * @param string|array $p_list_detail
	 * @param string $p_mode
	 * @param string|array $p_file_list
	 * @param string $p_remove_path
	 * @param bool $p_preserve
	 * @return bool
	 */
	public function _extractList(
		$p_path,
		&$p_list_detail,
		$p_mode,
		$p_file_list,
		$p_remove_path,
		$p_preserve = false
	) {
		$v_nb = 0;

		$p_path = $this->_translateWinPath($p_path, false);
		if ($p_path == '' || (substr($p_path, 0, 1) != '/'
				&& substr($p_path, 0, 3) != "../" && !strpos($p_path, ':'))
		) {
			$p_path = "./" . $p_path;
		}
		$p_remove_path = $this->_translateWinPath($p_remove_path);

		// ----- Look for path to remove format (should end by /)
		if (($p_remove_path != '') && (substr($p_remove_path, -1) != '/')) {
			$p_remove_path .= '/';
		}
		$p_remove_path_size = strlen($p_remove_path);

		switch ($p_mode) {
			case "complete" :
				$v_extract_all = true;
				$v_listing = false;
				break;
			case "partial" :
				$v_extract_all = false;
				$v_listing = false;
				break;
			case "list" :
				$v_extract_all = false;
				$v_listing = true;
				break;
			default :
				$this->_error('Invalid extract mode (' . $p_mode . ')');
				return false;
		}

		clearstatcache();

		while (strlen($v_binary_data = $this->_readBlock()) != 0) {
			$v_extraction_stopped = 0;

			if (!$this->_readHeader($v_binary_data, $v_header)) {
				return false;
			}

			if ($v_header['filename'] == '') {
				continue;
			}

			// ----- Look for long filename
			if ($v_header['typeflag'] == 'L') {
				if (!$this->_readLongHeader($v_header)) {
					return false;
				}
			}

			// ignore extended / pax headers
			if ($v_header['typeflag'] == 'x' || $v_header['typeflag'] == 'g') {
				$this->_jumpBlock(ceil(($v_header['size'] / 512)));
				continue;
			}

			if ((!$v_extract_all) && (is_array($p_file_list))) {
				// ----- By default no unzip if the file is not found
				$v_extract_file = false;

				for ($i = 0; $i < sizeof($p_file_list); $i++) {
					// ----- Look if it is a directory
					if (substr($p_file_list[$i], -1) == '/') {
						// ----- Look if the directory is in the filename path
						if ((strlen($v_header['filename']) > strlen($p_file_list[$i]))
							&& (substr($v_header['filename'], 0, strlen($p_file_list[$i]))
								== $p_file_list[$i])
						) {
							$v_extract_file = true;
							break;
						}
					} // ----- It is a file, so compare the file names
					elseif ($p_file_list[$i] == $v_header['filename']) {
						$v_extract_file = true;
						break;
					}
				}
			} else {
				$v_extract_file = true;
			}

			// ----- Look if this file need to be extracted
			if (($v_extract_file) && (!$v_listing)) {
				if (($p_remove_path != '')
					&& (substr($v_header['filename'] . '/', 0, $p_remove_path_size)
						== $p_remove_path)
				) {
					$v_header['filename'] = substr(
						$v_header['filename'],
						$p_remove_path_size
					);
					if ($v_header['filename'] == '') {
						continue;
					}
				}
				if (($p_path != './') && ($p_path != '/')) {
					while (substr($p_path, -1) == '/') {
						$p_path = substr($p_path, 0, strlen($p_path) - 1);
					}

					if (substr($v_header['filename'], 0, 1) == '/') {
						$v_header['filename'] = $p_path . $v_header['filename'];
					} else {
						$v_header['filename'] = $p_path . '/' . $v_header['filename'];
					}
				}
				if (file_exists($v_header['filename'])) {
					if ((@is_dir($v_header['filename']))
						&& ($v_header['typeflag'] == '')
					) {
						$this->_error(
							'File ' . $v_header['filename']
							. ' already exists as a directory'
						);
						return false;
					}
					if (($this->_isArchive($v_header['filename']))
						&& ($v_header['typeflag'] == "5")
					) {
						$this->_error(
							'Directory ' . $v_header['filename']
							. ' already exists as a file'
						);
						return false;
					}
					if (!is_writeable($v_header['filename'])) {
						$this->_error(
							'File ' . $v_header['filename']
							. ' already exists and is write protected'
						);
						return false;
					}
				} // ----- Check the directory availability and create it if necessary
				elseif (($v_result
						= $this->_dirCheck(
						($v_header['typeflag'] == "5"
							? $v_header['filename']
							: dirname($v_header['filename']))
					)) != 1
				) {
					$this->_error('Unable to create path for ' . $v_header['filename']);
					return false;
				}

				if ($v_extract_file) {
					if ($v_header['typeflag'] == "5") {
						if (!@file_exists($v_header['filename'])) {
							if (!@mkdir($v_header['filename'], 0777)) {
								$this->_error(
									'Unable to create directory {'
									. $v_header['filename'] . '}'
								);
								return false;
							}
						}
					} elseif ($v_header['typeflag'] == "2") {
						if (@file_exists($v_header['filename'])) {
							@unlink($v_header['filename']);
						}
						if (!@symlink($v_header['link'], $v_header['filename'])) {
							$this->_error(
								'Unable to extract symbolic link {'
								. $v_header['filename'] . '}'
							);
							return false;
						}
					} else {
						if (($v_dest_file = @fopen($v_header['filename'], "wb")) == 0) {
							$this->_error(
								'Error while opening {' . $v_header['filename']
								. '} in write binary mode'
							);
							return false;
						} else {
							$n = floor($v_header['size'] / 512);
							for ($i = 0; $i < $n; $i++) {
								$v_content = $this->_readBlock();
								fwrite($v_dest_file, $v_content, 512);
							}
							if (($v_header['size'] % 512) != 0) {
								$v_content = $this->_readBlock();
								fwrite($v_dest_file, $v_content, ($v_header['size'] % 512));
							}

							@fclose($v_dest_file);

							if ($p_preserve) {
								@chown($v_header['filename'], $v_header['uid']);
								@chgrp($v_header['filename'], $v_header['gid']);
							}

							// ----- Change the file mode, mtime
							@touch($v_header['filename'], $v_header['mtime']);
							if ($v_header['mode'] & 0111) {
								// make file executable, obey umask
								$mode = fileperms($v_header['filename']) | (~umask() & 0111);
								@chmod($v_header['filename'], $mode);
							}
						}

						// ----- Check the file size
						clearstatcache();
						if (!is_file($v_header['filename'])) {
							$this->_error(
								'Extracted file ' . $v_header['filename']
								. 'does not exist. Archive may be corrupted.'
							);
							return false;
						}

						$filesize = filesize($v_header['filename']);
						if ($filesize != $v_header['size']) {
							$this->_error(
								'Extracted file ' . $v_header['filename']
								. ' does not have the correct file size \''
								. $filesize
								. '\' (' . $v_header['size']
								. ' expected). Archive may be corrupted.'
							);
							return false;
						}
					}
				} else {
					$this->_jumpBlock(ceil(($v_header['size'] / 512)));
				}
			} else {
				$this->_jumpBlock(ceil(($v_header['size'] / 512)));
			}

			/* TBC : Seems to be unused ...
			if ($this->_compress)
			  $v_end_of_file = @gzeof($this->_file);
			else
			  $v_end_of_file = @feof($this->_file);
			  */

			if ($v_listing || $v_extract_file || $v_extraction_stopped) {
				$p_list_detail[$v_nb++] = $v_header;
				if (is_array($p_file_list) && (count($p_list_detail) == count($p_file_list))) {
					return true;
				}
			}
		}

		return true;
	}

	/**
	 * @return bool
	 */
	public function _openAppend()
	{
		if (filesize($this->_tarname) == 0) {
			return $this->_openWrite();
		}

		if ($this->_compress) {
			$this->_close();

			if (!@rename($this->_tarname, $this->_tarname . ".tmp")) {
				$this->_error(
					'Error while renaming \'' . $this->_tarname
					. '\' to temporary file \'' . $this->_tarname
					. '.tmp\''
				);
				return false;
			}
			$v_temp_tar = 0;
			if ($this->_compress_type == 'gz') {
				$v_temp_tar = @gzopen($this->_tarname . ".tmp", "rb");
			} elseif ($this->_compress_type == 'bz2') {
				$v_temp_tar = @bzopen($this->_tarname . ".tmp", "r");
			} elseif ($this->_compress_type == 'lzma2') {
				$v_temp_tar = @xzopen($this->_tarname . ".tmp", "r");
			}


			if ($v_temp_tar == 0) {
				$this->_error(
					'Unable to open file \'' . $this->_tarname
					. '.tmp\' in binary read mode'
				);
				@rename($this->_tarname . ".tmp", $this->_tarname);
				return false;
			}

			if (!$this->_openWrite()) {
				@rename($this->_tarname . ".tmp", $this->_tarname);
				return false;
			}

			if ($this->_compress_type == 'gz') {
				$end_blocks = 0;

				while (!@gzeof($v_temp_tar)) {
					$v_buffer = @gzread($v_temp_tar, 512);
					if ($v_buffer == ARCHIVE_TAR_END_BLOCK || strlen($v_buffer) == 0) {
						$end_blocks++;
						// do not copy end blocks, we will re-make them
						// after appending
						continue;
					} elseif ($end_blocks > 0) {
						for ($i = 0; $i < $end_blocks; $i++) {
							$this->_writeBlock(ARCHIVE_TAR_END_BLOCK);
						}
						$end_blocks = 0;
					}
					$v_binary_data = pack("a512", $v_buffer);
					$this->_writeBlock($v_binary_data);
				}

				@gzclose($v_temp_tar);
			} elseif ($this->_compress_type == 'bz2') {
				$end_blocks = 0;

				while (strlen($v_buffer = @bzread($v_temp_tar, 512)) > 0) {
					if ($v_buffer == ARCHIVE_TAR_END_BLOCK || strlen($v_buffer) == 0) {
						$end_blocks++;
						// do not copy end blocks, we will re-make them
						// after appending
						continue;
					} elseif ($end_blocks > 0) {
						for ($i = 0; $i < $end_blocks; $i++) {
							$this->_writeBlock(ARCHIVE_TAR_END_BLOCK);
						}
						$end_blocks = 0;
					}
					$v_binary_data = pack("a512", $v_buffer);
					$this->_writeBlock($v_binary_data);
				}

				@bzclose($v_temp_tar);
			} elseif ($this->_compress_type == 'lzma2') {
				$end_blocks = 0;

				while (strlen($v_buffer = @xzread($v_temp_tar, 512)) > 0) {
					if ($v_buffer == ARCHIVE_TAR_END_BLOCK || strlen($v_buffer) == 0) {
						$end_blocks++;
						// do not copy end blocks, we will re-make them
						// after appending
						continue;
					} elseif ($end_blocks > 0) {
						for ($i = 0; $i < $end_blocks; $i++) {
							$this->_writeBlock(ARCHIVE_TAR_END_BLOCK);
						}
						$end_blocks = 0;
					}
					$v_binary_data = pack("a512", $v_buffer);
					$this->_writeBlock($v_binary_data);
				}

				@xzclose($v_temp_tar);
			}

			if (!@unlink($this->_tarname . ".tmp")) {
				$this->_error(
					'Error while deleting temporary file \''
					. $this->_tarname . '.tmp\''
				);
			}
		} else {
			// ----- For not compressed tar, just add files before the last
			//       one or two 512 bytes block
			if (!$this->_openReadWrite()) {
				return false;
			}

			clearstatcache();
			$v_size = filesize($this->_tarname);

			// We might have zero, one or two end blocks.
			// The standard is two, but we should try to handle
			// other cases.
			fseek($this->_file, $v_size - 1024);
			if (fread($this->_file, 512) == ARCHIVE_TAR_END_BLOCK) {
				fseek($this->_file, $v_size - 1024);
			} elseif (fread($this->_file, 512) == ARCHIVE_TAR_END_BLOCK) {
				fseek($this->_file, $v_size - 512);
			}
		}

		return true;
	}

	/**
	 * @param $p_filelist
	 * @param string $p_add_dir
	 * @param string $p_remove_dir
	 * @return bool
	 */
	public function _append($p_filelist, $p_add_dir = '', $p_remove_dir = '')
	{
		if (!$this->_openAppend()) {
			return false;
		}

		if ($this->_addList($p_filelist, $p_add_dir, $p_remove_dir)) {
			$this->_writeFooter();
		}

		$this->_close();

		return true;
	}

	/**
	 * Check if a directory exists and create it (including parent
	 * dirs) if not.
	 *
	 * @param string $p_dir directory to check
	 *
	 * @return bool true if the directory exists or was created
	 */
	public function _dirCheck($p_dir)
	{
		clearstatcache();
		if ((@is_dir($p_dir)) || ($p_dir == '')) {
			return true;
		}

		$p_parent_dir = dirname($p_dir);

		if (($p_parent_dir != $p_dir) &&
			($p_parent_dir != '') &&
			(!$this->_dirCheck($p_parent_dir))
		) {
			return false;
		}

		if (!@mkdir($p_dir, 0777)) {
			$this->_error("Unable to create directory '$p_dir'");
			return false;
		}

		return true;
	}

	/**
	 * Compress path by changing for example "/dir/foo/../bar" to "/dir/bar",
	 * rand emove double slashes.
	 *
	 * @param string $p_dir path to reduce
	 *
	 * @return string reduced path
	 */
	private function _pathReduction($p_dir)
	{
		$v_result = '';

		// ----- Look for not empty path
		if ($p_dir != '') {
			// ----- Explode path by directory names
			$v_list = explode('/', $p_dir);

			// ----- Study directories from last to first
			for ($i = sizeof($v_list) - 1; $i >= 0; $i--) {
				// ----- Look for current path
				if ($v_list[$i] == ".") {
					// ----- Ignore this directory
					// Should be the first $i=0, but no check is done
				} else {
					if ($v_list[$i] == "..") {
						// ----- Ignore it and ignore the $i-1
						$i--;
					} else {
						if (($v_list[$i] == '')
							&& ($i != (sizeof($v_list) - 1))
							&& ($i != 0)
						) {
							// ----- Ignore only the double '//' in path,
							// but not the first and last /
						} else {
							$v_result = $v_list[$i] . ($i != (sizeof($v_list) - 1) ? '/'
									. $v_result : '');
						}
					}
				}
			}
		}

		if (defined('OS_WINDOWS') && OS_WINDOWS) {
			$v_result = strtr($v_result, '\\', '/');
		}

		return $v_result;
	}

	/**
	 * @param $p_path
	 * @param bool $p_remove_disk_letter
	 * @return string
	 */
	public function _translateWinPath($p_path, $p_remove_disk_letter = true)
	{
		if (defined('OS_WINDOWS') && OS_WINDOWS) {
			// ----- Look for potential disk letter
			if (($p_remove_disk_letter)
				&& (($v_position = strpos($p_path, ':')) != false)
			) {
				$p_path = substr($p_path, $v_position + 1);
			}
			// ----- Change potential windows directory separator
			if ((strpos($p_path, '\\') > 0) || (substr($p_path, 0, 1) == '\\')) {
				$p_path = strtr($p_path, '\\', '/');
			}
		}
		return $p_path;
	}
}
